A5041837939- Geology and Paleoclimatology Research
- Climate variability and models
- Paleontology and Stratigraphy of Fossils
- Evolution and Paleontology Studies
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Marine and coastal ecosystems
- Meteorological Phenomena and Simulations
- Geological Studies and Exploration
- Isotope Analysis in Ecology
- Hydrocarbon exploration and reservoir analysis
- Climate Change and Health Impacts
- Marine and environmental studies
- Oceanographic and Atmospheric Processes
- Geological formations and processes
- Tropical and Extratropical Cyclones Research
- Cryospheric studies and observations
- Geological and Geophysical Studies
- Urban Heat Island Mitigation
- Marine Biology and Ecology Research
- Plant Water Relations and Carbon Dynamics
- Climate change impacts on agriculture
- Effects of Environmental Stressors on Livestock
- Scientific Computing and Data Management
- Ocean Waves and Remote Sensing
Purdue University West Lafayette
2016-2025
University of New Hampshire at Manchester
2019-2023
Climate and Global Dynamics Laboratory
2022
NSF National Center for Atmospheric Research
2022
Purdue University Northwest
2022
J.M. Huber Corporation (United States)
2022
University of New Hampshire
2014-2019
Georgetown University
2019
Charles River Laboratories (Netherlands)
2018
Texas A&M University
2016
Despite the uncertainty in future climate-change impacts, it is often assumed that humans would be able to adapt any possible warming. Here we argue heat stress imposes a robust upper limit such adaptation. Peak stress, quantified by wet-bulb temperature T W , surprisingly similar across diverse climates today. never exceeds 31 °C. Any exceedence of 35 °C for extended periods should induce hyperthermia and other mammals, as dissipation metabolic becomes impossible. While this happens now,...
About 34 million years ago, Earth's climate shifted from a relatively ice-free world to one with glacial conditions on Antarctica characterized by substantial ice sheets. How temperature changed during this transition remains poorly understood, and evidence for Northern Hemisphere polar is controversial. Here, we report proxy records of sea surface temperatures multiple ocean localities show that the high-latitude decrease was heterogeneous. High-latitude (45 degrees 70 in both hemispheres)...
Abstract. The early Eocene "equable climate problem", i.e. warm extratropical annual mean and above-freezing winter temperatures evidenced by proxy records, has remained as one of the great unsolved problems in paleoclimate. Recent progress modeling paleoclimate development provides an opportunity to revisit this problem ascertain if current generation models can reproduce past features without extensive modification. Here we have compiled terrestrial temperature data compared with model...
Antarctica glaciation began soon after a large decrease in the concentration of atmospheric carbon dioxide around 35 million years ago.
Abstract The Miocene epoch (23.03–5.33 Ma) was a time interval of global warmth, relative to today. Continental configurations and mountain topography transitioned toward modern conditions, many flora fauna evolved into the same taxa that exist climate dynamic: long periods early late glaciation bracketed ∼2 Myr greenhouse interval—the Climatic Optimum (MCO). Floras, faunas, ice sheets, precipitation, p CO 2 , ocean atmospheric circulation mostly (but not ubiquitously) covaried with these...
Abstract. The early Eocene (~55 to 50 Ma) is a time period which has been explored in large number of modelling and data studies. Here, using an ensemble previously published model results, making up "EoMIP" – the Modelling Intercomparison Project syntheses terrestrial sea surface temperature data, we present self-consistent inter-model model–data comparison. This shows that previous studies exhibit very wide variability, but at high CO2, there good agreement between models for this period,...
Projections of future climate depend critically on refined estimates sensitivity. Recent progress in temperature proxies dramatically increases the magnitude warming reconstructed from early Paleogene greenhouse climates and demands a close examination forcing feedback mechanisms that maintained this warmth broad dynamic range these paleoclimate records attest to. Here, we show several complementary resolutions to questions are possible context model simulations using modern configurations....
Abstract. The early Eocene (56 to 48 million years ago) is inferred have been the most recent time that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Global mean temperatures were also substantially warmer than those of present day. As such, study climate provides insight into how a super-warm Earth system behaves and offers an opportunity evaluate models under conditions high greenhouse gas forcing. Deep Time Model Intercomparison Project (DeepMIP) systematic model–model...
Abstract. We implement and analyze 13 different metrics (4 moist thermodynamic quantities 9 heat stress metrics) in the Community Land Model (CLM4.5), land surface component of Earth System (CESM). call these routines HumanIndexMod. limit algorithms HumanIndexMod to meteorological inputs temperature, moisture, pressure for their calculation. All assume no direct sunlight exposure. The goal this project is a common framework calculating operationally used metrics, climate models, offline...
During rapid global warming 56 million years ago, tropical sea surface temperatures exceeded 36°C and stressed eukaryotic plankton.
As the world overheats—potentially to conditions warmer than during three million years over which modern humans evolved—suffering from heat stress will become widespread. Fundamental questions about humans’ thermal tolerance limits are pressing. Understanding as a process requires linking network of disciplines, human health and evolutionary theory planetary atmospheres economic modeling. The practical implications equally transdisciplinary, requiring technological, engineering, social,...
Abstract. Accurate estimates of past global mean surface temperature (GMST) help to contextualise future climate change and are required estimate the sensitivity system CO2 forcing through Earth's history. Previous GMST for latest Paleocene early Eocene (∼57 48 million years ago) span a wide range (∼9 23 °C higher than pre-industrial) prevent an accurate assessment during this extreme greenhouse interval. Using most recent data compilations, we employ multi-method experimental framework...
Abstract. We present results from an ensemble of eight climate models, each which has carried out simulations the early Eocene optimum (EECO, ∼ 50 million years ago). These have been in framework Deep-Time Model Intercomparison Project (DeepMIP; http://www.deepmip.org, last access: 10 January 2021); thus, all models configured with same paleogeographic and vegetation boundary conditions. The indicate that these non-CO2 conditions contribute between 3 5 ∘C to warmth. Compared previous...
Abstract The Miocene epoch, spanning 23.03–5.33 Ma, was a dynamic climate of sustained, polar amplified warmth. atmospheric CO 2 concentrations are typically reconstructed between 300 and 600 ppm were potentially higher during the Climatic Optimum (16.75–14.5 Ma). With surface temperature reconstructions pointing to substantial midlatitude warmth, it is unclear what processes maintained much weaker‐than‐modern equator‐to‐pole difference. Here, we synthesize several modeling efforts together...